known as the "soldier guards," were added to the top of the wall during World War I. A dirt path has formed on the ground at the base of the wall from people walking around it.; The massive scale of the graveyard wall at the San Estevan del Rey...

A dirt road on the east side of Park Point in Mesa Verde National Park winds through the sloping hillside. Snow lines the sides of the road, and vehicles have formed tracks in the middle of the muddy roadway. Snowcapped mountain peaks are in the...

The Ouray Spring Teepee stands in the foreground behind a wire fence with stick posts. The concrete teepee houses the spring from which Ouray, chief of the Utes from 1820 until 1880, and his wife, Chipeta, obtained water when they lived on a farm...

The Ouray Spring Teepee near Montrose stands behind a short rock wall lightly covered with snow. The concrete teepee houses a cold-water spring from which Ouray, chief of the Utes from 1820 until 1880, and his wife, Chipeta, obtained drinking and...

Men wearing sombreros lead a wagon pulled by donkeys toward the Puerta de Tierra [Land Gate], in Campeche, Mexico. Built in 1732, it is one of the four entrances to the main quarters enclosed by fortifications designed by French engineer Louis...

Ruins of buildings at the Laguna Pueblo in New Mexico stand in the foreground. The structures are flat-roofed and made of stone and adobe. The doorways and windows are framed with wood. Portions of wood beams protrude from under the rooflines. A...

structure are in the foreground. Additional mesas, including the "Enchanted Mesa," stand in the distance. The mission and convent are thought to have been built by Fray Juan Ramirez between 1629 and 1641.; The Pueblo Acoma Mission and convent...

A row of small buildings of the Laguna Pueblo in New Mexico is shown from the back. Wooden ladders lead to the upper levels of the structures. The windows and doors are framed with wood. The surface of the ground is composed of large slabs of rock....

Jesse Nusbaum, far right, stands with his excavation team, including his stepson Deric, third from left, at their camp above Step House in Mesa Verde National Park. Standing at Deric's left is the park's future superintendent Marshall Finnan. Four...

A light-colored, flowering shrub stands in the foreground of this view from the head of Navajo Canyon near Mesa Verde National Park. A large branch of dry wood lies on the ground next to the shrub. Similar shrubs scatter the area.

A pithouse of Step House, a cliff dwelling in Mesa Verde National Park, stands in the foreground. Large pieces of rock form part of a ring along the front side of the pithouse. Boxes and bags are on the far ledge. A pick ax lies in the right...

A Native American woman prods the fire in a round, covered oven on the roof of a house at the Zuni Pueblo in New Mexico. Smoke wafts from the pipe behind where she leans over. A wood tray of unbaked loaves of bread sits near her bare feet.

cross over the building. People have made tracks walking in the snow in the foreground.; The museum at Mesa Verde National Park sits on a gently sloping hillside covered in snow. Juniper trees line the front of the museum, built by Jesse Nusbaum,...

Julian Martinez of San Ildefonso Pueblo stands at the base of a cliff among the ruins of Long House, an ancient cliff dwelling, Bandelier National Monument, New Mexico. Several portions of stone walls from Long House remain standing. A set of stone...

A small boy, possibly Popovi, son of Maria and Julian Martinez of the San ildefonso Pueblo in New Mexico, sits in a round, metal bath tub crying. The tub is set up on a wood ledge. He holds the side of the tub with his left hand.

Julian Martinez of the San Ildefonso Pueblo in New Mexico poses for a half-length, side portrait. His long hair is tied with braided strings and hangs on either side of his chest. He wears an earring in his left ear. He and his wife, Maria, are...

Jesse Nusbaum stands between two men in front of a large juniper tree at their camp at Hawikuh, a Zuni Pueblo in western New Mexico. Dressed in work clothes, the men stand near a tent that is set up on top of a wooden platform.

Deric Nusbaum, Jesse Nusbaum's stepson, walks through the deep snow along a road in Mesa Verde National Park. He wears a hat and snowshoes and turns his head back toward the camera. Snow-covered trees line the road.

Two small children, possibly Popovi and Felip, sons of Maria and Julian Martinez of the San Ildefonso Pueblo in New Mexico, sit together in a metal bath tub crying. The tub sits on a wood ledge. The younger child, left, has his arm around the older...

John D. Rockefeller, Jr. sits on a rock wall among the ruins of Cliff Palace at Mesa Verde National Park. Five other men, including Dr. R.W. Corwin, second from right, and Bert Mattison, right, sit with Rockefeller on the wall. Rockefeller's three...

Spruce Tree House, one of Mesa Verde National Park's largest cliff dwellings, lies underneath a distant, large rock overhang that is dusted with snow. In the foreground, snow blankets the shrubs and trees on the hill leading down to the ruins.

A man stands with a pack mule in a narrow street below Guadalupe in Santa Fe, New Mexico. The mule carries a large load on its back. A young man stands behind them leaning against the corner of a flat-roofed building. The porch of another building...

John D. Rockefeller, Jr., second from the left, sits with his legs dangling from a wall among the ruins of Cliff Palace at Mesa Verde National Park. Five other men, including Dr. R.W. Corbin, second from right, and Bert Mattison, right, sit with...

Julian Martinez of the San Ildefonso Pueblo in New Mexico steps out of a ceremonial cave among the ruins of Bandelier National Monument in New Mexico. The wood ladder has tall sidepieces that extend several feet past the rungs. A man is crouched...

A pyramid-like structure with a flat-roofed building on its peak stands in a field at Chichen Itza on the Yucatan Peninsula in Mexico. The ruins date back to the Mayan Empire. Vehicles have formed tracks in the dirt road that winds along the side...

A group of men stand with their pack horses on the ledge above Step House, a cliff dwelling in Mesa Verde National Park. Squatting near his horse is future park superintendent Marshall Finnan. The remains of some of the structures are in the shadow...

Two men stand above the excavation site of Pithouses A, B and C in Step House, a cliff dwelling in Mesa Verde National Park. Dirt has been removed from the round sites underneath a large rock overhang. Digging tools and boxes lie scattered around...

A Native American man poses for a studio bust portrait. Shown at a side angle, he wears a round, flat-rimmed hat and a silk scarf tied around his neck. A handkerchief sticks up from the breast pocket of his suit coat. His long braids rest on either...

An unidentified Native American man poses for a studio portrait. He wears a dark feather headdress adorned with a beaded band and ribbons. His hair is in braids. He wears a shawl around his shoulders and holds his hands in his lap. A second shawl...

A horse-drawn wagon stands on a dirt road built into a steep hillside, possibly Knife Edge Road, in Mesa Verde National Park. Workers are gathered near the wagon, where several large slabs of rock also lie. Additional men stand above them on the...

Two men hoist Deric Nusbaum, Jesse's stepson, over the ledge of a steep cliff, possibly Knife Edge, in Mesa Verde National Park. Deric has a rope tied around him under his arms. The massive cliff continues up from where the men are pulling....

A group of men digs at the base of a rock overhang in Fewkes Canyon in Mesa Verde National Park. Dressed in work clothes, several of the men are huddled over. Several shovels rest on the ledge above where the men dig. Another man stands on the...

A piece of wood and a round stone lie next to a hole in Pithouse A of Step House, a cliff dwelling at Mesa Verde National Park. Other pieces of wood protrude from the ground and the wall above the hole. A metal plate and bowl lie on an upper ledge...

pick ax.; Pithouses A, B and C of Step House lie at the base of a massive rock overhang in Mesa Verde National Park. The cliff dwelling site is under excavation, and men stand holding shovels in their hands. The man in the background is future...

Pithouse A of Step House, a cliff dwelling in Mesa Verde National Park, stands in the foreground. A small pile of sandstone slabs forms a wall on the near edge of the pithouse. Additional slabs line the sides of the pithouse. Two men kneel working...

A man walks up a series of makeshift stone steps that lead from the Step House cliff dwelling to the top of a mesa in Mesa Verde National Park. Huge boulders line either side of the steps. A bare shrub stands in the foreground.

Men work to excavate one of the ruins of a cliff dwelling, possibly in the Wetherill Mesa, in Mesa Verde National Park. A large trench has been dug in the ground below a huge rock overhang. Shrubs are in the right foreground.

A man stands in front of El Castillo Temple, Tulum, Quintana Roo, Mexico, he wears a wide-brimmed hat and has his pant legs rolled up above his knees. A rifle lies on a rock in the foreground. Overgrown shrubs line the area.

A cliff dwelling at Mesa Verde National Park is tucked under a rock overhang. Shown from below, several window openings remain intact in the ruins. The cliff has several layers of rock with varying widths. Trees line the top ledge of the overhang...

A piece of wood lies next to a round stone on the dirt ground of Pithouse A of Step House, one of Mesa Verde National Park's cliff dwellings. A small hole is next to the rock. Additional pieces of wood protrude from the ground and the dirt wall...

Deric Nusbaum, Jesse's stepson, stands at a distance leaning against one of the remaining walls of Nordenskiold's Ruin No. 12 at Mesa Verde National Park. The cliff dwelling is built into the side of a sheer cliff.

Deric Nusbaum, Jesse's stepson, stands underneath the huge rock overhang at the site of Step House, a cliff dwelling at Mesa Verde National Park. He holds his left arm straight up to touch the rock overhang. The site has not been excavated. A man...